DiffFilterFields: Make diff_filter operators compatible with fields

refactor(fluids): Make j, k consisitent

When doing double for loops, `j` should be components and `k` should be
coordinate direction, such that Grad_v[k][j][i] indexes the gradient
array coming from

refactor(fluids): Make j, k consisitent

When doing double for loops, `j` should be components and `k` should be
coordinate direction, such that Grad_v[k][j][i] indexes the gradient
array coming from libCEED

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fluids: Add MMS test for differential filtering

MMS = method of manufactured solutions

fluids: Add wall-damping to differential filter

fluids: Add differential filtering setup

fluids: Add differential filtering QFs

fluids: Add grid_aniso collocated vector function

fluids: Blasius IC for primitive variables

fluids: Move to state enum for state functions

fluids: Define in/out in docstring params

refactor(fluids): Dirichlet -> Strong BC

- Use "strong" and "dirichlet" to refer to the same thing
(hard-contrained degrees-of-freedom). Chose "strong", as dirichlet may
be enforced weakly.

fluids: Enable TSSetErrorIfStepFails when testing

- Misc error fixes too
- And style change to match index sizes for similar loops
- Other similar nested for loops have `j<5` and `k<3`, so cha

fluids: Enable TSSetErrorIfStepFails when testing

- Misc error fixes too
- And style change to match index sizes for similar loops
- Other similar nested for loops have `j<5` and `k<3`, so changed
this one to match

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fluids: Apply nodal SGS tensor to IFunction

fluids: Add nodal evaluation of SGS DD Model

fluids: Project grid anisotropy tensor

fluids: Add QF for velocity gradient L^2 projection

fluids: Add data-driven SGS evaluation QFunctions

- This includes transforming to/from the anisotropic physical-frame to
isotropic S-frame

fluids: Add rotation rate, velocity gradient helpers

- Also change KMStrainRate to KMStrainRate_State, leaving KMStrainRate
to be a generic interface to the velocity gradient

fluids: Add linear algebra tools to utils.h

fluids: Add symmetric eigensolver QF helper

- Adapted from https://github.com/jewettaij/jacobi_pd

fluids: Read in files for SGS Data-Driven Model

Ken/idl (#1138)

* inflow sponge pushing p towards P0 compiles and runs but unknown yet whether it is effective or not

* looks like my first attempt at this is missing something as there is neglig

Ken/idl (#1138)

* inflow sponge pushing p towards P0 compiles and runs but unknown yet whether it is effective or not

* looks like my first attempt at this is missing something as there is negligible effect from Jacobian addition

* examples/fluids: IDL fixes and demo

* Fix IDL sign error and rename variables/clang-format
* Let newtonianwave.yaml use -reference_pressure and temperature
* Propagate P0 = reference.pressure

* Small tweak to add IDL to the 3 ramp parameters.

* fluids: Extract fluids binary vector load function

- Needs to be used in multiple places (for ICs and for testing data)

* fluids: Correct typo in previous commits

* fluids: Add IDL and newtonian wave test

* fluids: Rename Newtonian Wave --> Gaussian Wave

* fluids: Move RampCoefficient into utils

- Also change name to LinearRampCoefficient, as we may have different
kinds of ramps in the future

* fluids: Change IDL commandline options

* docs(fluids): Document internal damping layer

Co-authored-by: Jed Brown <jed@jedbrown.org>

* fluids: Add ScaleN QF utility

* fluids: Extract InternalDampingLayer QFunction helper

---------

Co-authored-by: Jed Brown <jed@jedbrown.org>
Co-authored-by: KennethEJansen <jansenke@colorado.edu>
Co-authored-by: James Wright <james@jameswright.xyz>

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fluids: Misc doc fixes and code style changes

Merge pull request #1145 from prj-/jolivet/warnings

Fix -Wextra-semi -Wmissing-field-initializers

fluids: Stats collection weighted in QFunction

- Allows for only keeping one CeedVector for child statistics